I don't have headaches but I do have visual migraines occasionally,
and 250 mg of non-flush niacin keeps them away. Opens up the vessels. Now
I don't know if classical migraines have open or closed vessels, so this would not
be good if your vessels are already open a lot.

For just dimness of vision it is possible Luetine Eyes would help. It's for macular degeneration. I do not have macular, but my parents did have, at relatively young ages, so mine is preventive. And of course I presume you are getting a little Vitamin A in a
multivitamin? Mine is low dose all food source Megafoods Without Iron.

I just ordered some Nattokinase which I'll experiment with to reduce blood viscosity, which is a danger with high platelets--I don't know if this would be good for you, but it's a possibility. People take it instead of Warfarin. I have not tried it yet. And I take Vitamin E complex which is a mild blood thinner. (NOW brand Gamma E complex).
Just guessing at the cause of your misery of eyes.

I had ON or whatever it was for 8 years, with blind spot, double vision, pain in light,
inability to watch TV, and could not have run a computer. So I know what semi-blind is.
No fun.